The Code Breaker

by Walter Isaacson

What none of the participants discussed was a longer-range prospect: using CRISPR to engineer inheritable edits in humans that would make our children, and all of our descendants, less vulnerable to virus infections. These genetic improvements could permanently alter the human race. “That’s in the realm of science fiction,” Doudna said dismissively when I raised the topic after the meeting. Yes, I agreed, it’s a bit like Brave New World or Gattaca. But as with any good science fiction, elements have already come true. In November 2018, a young Chinese scientist who had been to some of Doudna’s gene-editing conferences used CRISPR to edit embryos and remove a gene that produces a receptor for HIV, the virus that causes AIDS. It led to the birth of twin girls, the world’s first “designer babies.”